Seed coat development

Šola, Krešimir (2012) Seed coat development. Bachelor's thesis, Faculty of Science > Department of Biology.

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Seed coat development is best described for Arabidopsis thaliana. Development of a seed coat from two ovule integuments starts right after fertilization. Signal for this process comes from an endosperm. Changes occuring during seed coat development are based on differentiation and, to a small degree, on cell elongation. Outer integument differentiates into epidermal layer, while the inner becomes endothelium. Cells of the epidermal layer synthesize and secrete mucilage and, at late stages, secondary cell walls. Mucilage covers the surface of a mature seed, thus in contact with water it can imbibe and be released. During mucilage synthesis and secretion the cell interior is volcano-shaped, which is evident on the outside. Cells of the innermost endothelium layer synthesize proanthocyanidins (PA), which oxidize at late stages of development and turn from colourless into brown. Two outer layers of the inner integument go through programmed cell death (PCD) in early stages. Growth of embrio and endosperm causes all layers except the outermost to compress and break. Seed coat development can serve as an excellent model for PCD research, as well as for targeted secretion. This area of plant developmental biology is still challenging, since differentiation control pathways and some structural gene functions still have to be elucidated.

Item Type: Thesis (Bachelor's thesis)
Supervisor: Leljak Levanić, Dunja
Date: 2012
Number of Pages: 14
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 13 Oct 2014 09:00
Last Modified: 16 Feb 2016 14:08

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